LCD Fabrication Method Using Slit Exposure for Simultaneous Electrode Formation
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Solution Overview
Problem
The existing fabrication methods for liquid crystal displays (LCDs) require multiple photolithography processes, leading to decreased production yields, increased costs, and higher likelihood of defective thin film transistors (TFTs) due to the complexity and expense of masks used in patterning.
Innovation Solution
A method that reduces the number of photolithography steps by forming gate electrodes, common electrodes, and pixel electrodes simultaneously using a slit or half-tone mask, thereby simplifying the process and potentially reducing defects and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple photolithography processes are used to form gate electrodes, common electrodes, and pixel electrodes separately, then the electrodes can be formed with precise patterns, but the number of manufacturing steps increases, leading to decreased production yields and increased costs
Solution Approach 1:
The patent combines the formation of gate electrodes, common electrodes, and pixel electrodes into a single photolithography process. By using a unified mask pattern that simultaneously defines all electrode types, the manufacturing process reduces the number of photolithography steps from multiple separate processes to one consolidated process, thereby improving production yield while maintaining pattern precision
Solution Approach 2:
The single photolithography mask serves multiple functions by simultaneously patterning different electrode types (gate electrodes, common electrodes, and pixel electrodes) with different patterns. This universal approach allows one mask to perform what previously required multiple specialized masks, reducing manufacturing complexity and improving productivity
2Manufacturing precision
If multiple photolithography processes are used to pattern electrodes and insulation films, then detailed patterns can be achieved, but the complexity and expense of masks increases
Solution Approach 1:
The patent merges the patterning of multiple electrode types and insulation films into a single photolithography step using one mask. This consolidation reduces mask complexity from multiple separate masks to a single universal mask that defines all patterns simultaneously, while maintaining the detailed patterns required for functional electrodes through careful design of the unified mask geometry
3Adaptability or versatility
If separate photolithography processes are used for each electrode type, then each electrode can be optimized independently, but the fabrication process becomes more complex and time-consuming
Solution Approach 1:
The patent combines separate electrode formation processes into a single photolithography step, reducing fabrication process complexity from multiple sequential steps to one consolidated process. The unified mask design allows independent optimization of each electrode type through carefully engineered pattern regions, maintaining adaptability while simplifying the overall manufacturing workflow
Data Source
AI summary
A method of fabricating an LCD includes providing first and second substrates. A gate electrode, a gate line, a connection electrode, a common electrode and a pixel electrode are formed on the first substrate through a first making process. A first insulation film is formed on the first substrate. A first insulation film pattern having multiple contact holes are formed through a second masking process. An active pattern is formed on the first substrate and source and drain electrodes are operationally connected with the active pattern through some of the contact holes. A gate electrode, a common electrode, and a pixel electrode may be formed substantially together through a slit exposure. An active pattern and source and drain electrodes may be formed substantially together. The number of masks needed to fabricate the display may be reduced to simplify a fabrication process and protect a channel region.